US10154416B2 - Data processing method, and communications device and system - Google Patents

Data processing method, and communications device and system Download PDF

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US10154416B2
US10154416B2 US15/223,395 US201615223395A US10154416B2 US 10154416 B2 US10154416 B2 US 10154416B2 US 201615223395 A US201615223395 A US 201615223395A US 10154416 B2 US10154416 B2 US 10154416B2
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data packet
data
spectrum resource
sent
unlicensed spectrum
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US20160337870A1 (en
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Qufang HUANG
Wenji Liu
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]

Definitions

  • Embodiments relate to the communications field, and in particular, to a data processing method, and a communications device and system.
  • a fixed spectrum allocation policy is widely used. Spectrum allocation is performed by a relevant national institution or a standard organization, to separately allocate a part of spectrums to specified institutions to perform particular services.
  • a spectrum that is specified to be allocated is referred to as a licensed spectrum, and a spectrum that is not specified to be allocated is referred to as an unlicensed spectrum.
  • a communications device may communicate with a peer device by using the licensed spectrum and the unlicensed spectrum.
  • the licensed spectrum is stable and sustainable, and the unlicensed spectrum is relatively unstable and unsustainable.
  • WiFi Wireless Fidelity
  • LTE Long Term Evolution
  • the unlicensed spectrum cannot be used stably for a long time.
  • a situation in which the unlicensed spectrum is available in a period of time, but is unavailable in a next period of time may occur.
  • the originally available unlicensed spectrum becomes unavailable, but a data retransmission process is not ended, and continues waiting for a proper occasion on the unlicensed spectrum.
  • obviously data cannot be sent in time, and packet loss may occur because of a timeout, thereby affecting timeliness and even stability of data transmission.
  • Embodiments provide a data processing method, and a communications device and system. When a currently-used unlicensed spectrum resource is unavailable, retransmission can be triggered in time.
  • the embodiments provide a communications device, including a sending unit 301 and a processing unit 307 .
  • the sending unit ( 301 ) is configured to transmit a data packet to a receiving node by using an unlicensed spectrum resource and by using a hybrid automatic repeat request (HARQ) process.
  • the processing unit ( 307 ) is configured to: determine that the unlicensed spectrum resource used by the sending unit is unavailable, determine that an unsuccessfully-sent data packet exists in the HARQ process, and trigger automatic repeat request (ARQ) retransmission for the unsuccessfully-sent data packet.
  • ARQ automatic repeat request
  • the determining unit ( 3071 ) is further configured to determine that the unsuccessfully-sent data packet includes the RLC data of the AM mode or includes the important data.
  • the control unit ( 3075 ) is configured to: after the determining unit determines that the unlicensed spectrum resource is unavailable and the unsuccessfully-sent data packet exists, and determines that the unsuccessfully-sent data packet includes the RLC data of the AM mode or includes the important data, trigger the ARQ retransmission for the unsuccessfully-sent data packet.
  • the communications device further includes: a first MAC layer execution unit ( 500 ), configured to execute the HARQ process by using the unlicensed spectrum resource; an RLC layer execution unit ( 505 ), configured to execute RLC retransmission; and a second MAC layer execution unit ( 507 ), configured to execute the HARQ process by using an available spectrum resource, where the processing unit ( 307 ) being configured to trigger the ARQ retransmission for the unsuccessfully-sent data packet includes: instructing the first MAC layer execution unit ( 500 ) to send, to the RLC layer execution unit, a first message used to trigger the RLC layer to execute the ARQ retransmission, where the first message includes first information, the first information is used to identify the first data packet, and the first data packet is the data packet that is unsuccessfully sent by the first MAC layer execution unit ( 500 ) by using the unlicensed spectrum resource; the RLC layer execution unit ( 505 ) retransmits the first data packet according to the first information included in the first message; and the second MAC layer execution unit
  • the embodiments provides a data processing method.
  • the method includes transmitting, by a communications device, a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process.
  • the method includes determining, by the communications device, that the unlicensed spectrum resource is unavailable and an unsuccessfully-sent data packet exists in the HARQ process.
  • the method also includes triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet.
  • the method before the triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet, the method further includes: determining that the unsuccessfully-sent data packet includes RLC data of an AM mode or includes important data.
  • the communications device is user equipment; and after the determining, by the communications device, that the unlicensed spectrum resource is unavailable, the method further includes: generating the BSR; or further includes: after it is determined that a timer related to the BSR triggered to be generated is running, setting the timer to be timed out.
  • the method before the generating the BSR, the method further includes determining that the unsuccessfully-sent data packet includes the BSR.
  • the communications device is user equipment; and after the determining, by the communications device, that the unlicensed spectrum resource is unavailable, the method further includes: determining that an unsuccessfully-sent data packet includes a PHR, and generating the PHR, or the method further includes: after it is determined that a timer related to the PHR triggered to be generated is running, setting the timer to stop.
  • the triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet includes: sending, by a MAC layer that uses the unlicensed spectrum resource in the communications device, to an RLC layer in the communications device, a first message used to trigger the RLC layer to execute the ARQ retransmission, where the first message includes first information, the first information is used to identify the first data packet, and the first data packet is the data packet that is unsuccessfully sent by the MAC layer by using the unlicensed spectrum resource; retransmitting, by the RLC layer, the first data packet according to the first information included in the first message; and acquiring, by a MAC layer that uses an available spectrum resource in the communications device, the first data packet from the RLC layer, and sending the first data packet to a peer device.
  • the embodiments provide a communications system, including a base station and user equipment, where the foregoing communications device is used as the base station, and the foregoing communications device may be used as the user equipment.
  • a corresponding solution is provided for a problem of data delay caused by the unavailability of the unlicensed spectrum resource, to ensure timeliness and stability of data.
  • a communications device transmits a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process.
  • the communications device determines that the unlicensed spectrum resource is unavailable and an unsuccessfully-sent data packet exists in the HARQ process.
  • the communications device triggers ARQ retransmission for the unsuccessfully-sent data packet.
  • the embodiments provide a communications system, including a base station and user equipment, where the foregoing communications device is used as the base station, and the foregoing communications device may be used as the user equipment.
  • a corresponding solution is provided for a problem of data delay caused by the unavailability of the unlicensed spectrum resource.
  • automatic repeat request (ARQ) retransmission is triggered for the unsuccessfully-sent data packet, so that the communications device directly selects an available spectrum resource at the beginning of resource scheduling to perform transmission, thereby shortening a waiting time and ensuring timeliness and stability of data.
  • ARQ automatic repeat request
  • FIG. 1 is a schematic diagram of a data transmission process in the prior art
  • FIG. 2 is a schematic diagram of a data processing method according to an embodiment
  • FIG. 3 is a schematic diagram of a communications device according to an embodiment
  • FIG. 4 is a schematic diagram of a communications device according to an embodiment
  • FIG. 5 is a schematic diagram of a communications device according to an embodiment.
  • FIG. 6 is a schematic diagram of a communications system according to an embodiment.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS general packet radio service
  • LTE Long Term Evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS Universal Mobile Telecommunications System
  • a terminal device is also referred to as user equipment (UE for short), a terminal, a mobile station (MS for short), a mobile terminal, and the like.
  • the terminal device may communicate with one or more core networks by using a radio access network (RAN for short).
  • RAN radio access network
  • the terminal device may be a mobile phone (also referred to as a “cellular” phone) or a computer with a mobile terminal.
  • the terminal device may be a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus, which exchanges voice and/or data with the radio access network.
  • a base station may be a base station (Base Transceiver Station, “BTS” for short) in GSM or CDMA, or may be a base station (NodeB, “NB” for short) in WCDMA, or may be an evolved NodeB (“eNB or e-NodeB” for short) in LTE.
  • BTS Base Transceiver Station
  • NodeB NodeB
  • eNB evolved NodeB
  • LTE Long Term Evolution-NodeB
  • FIG. 1 shows a transmitting node T and a receiving node R.
  • Each node includes a radio link control (RLC) entity and a Media Access Control (MAC) entity.
  • RLC radio link control
  • MAC Media Access Control
  • a first RLC entity 101 is configured to bear a data service.
  • Each RLC entity 101 may at least schedule a first MAC entity 1031 and a second MAC entity 1032 .
  • the first MAC entity 1031 is configured to send a data packet in a licensed spectrum
  • the second MAC entity 1032 is configured to send a data packet in an unlicensed spectrum.
  • the data packets may include data or may include control information.
  • the MAC entities in the transmitting node T send the data packets to MAC entities in the receiving node R by using an HARQ process.
  • a third MAC entity 2031 is configured to receive the data packet in the licensed spectrum
  • a fourth MAC entity 2032 is configured to receive the data packet in the unlicensed spectrum.
  • the third and the fourth MAC entities send the received data packets to a second RLC entity 201 in the receiving node R.
  • the second RLC entity 201 performs data processing on the received data packet, to restore raw data.
  • the process of data retransmission is represented as the HARQ process at a MAC layer, and is represented as an ARQ process at an RLC layer.
  • the ARQ process includes initial transmission and ARQ retransmission.
  • the HARQ process and the ARQ process are two independent retransmission processes.
  • the HARQ process and the ARQ process are both automatic retransmission processes, and have respective maximum quantities of retransmission times.
  • the receiving node feeds back whether the data packet is correctly decoded to the transmitting node, that is, sends an acknowledgement (Acknowledgement, ACK) or a negative acknowledgement (Negative Acknowledgement, NACK) to the transmitting node. If the feedback is a NACK, the transmitting node retransmits the data.
  • the maximum quantity of retransmission times for which retransmission may be performed is preset, for example, five times. If the data is still not successfully sent when the maximum quantity of retransmission times is reached, an HARQ entity in the transmitting node stops sending the data packet at the MAC layer.
  • the ARQ process of the RLC layer is as follows: After the transmitting node transfers the data packet from the RLC layer to the MAC layer, a timer is started. When the timer is timed out and the transmitting node has not received a status report that is from the receiving node and that indicates that the data packet is successfully sent, data of the RLC layer is triggered to be retransmitted. Initiating of resending performed by the RLC layer each time is referred to as triggering of the ARQ retransmission.
  • the foregoing sent data packet may be a data packet including data of the AM mode.
  • An RLC entity and a MAC entity in a same node are collaborative.
  • a corresponding ARQ process and HARQ process are associated.
  • the second MAC entity 1032 notifies the first RLC entity 101 that 150 bytes may be sent in an unlicensed spectrum, the RLC entity 101 sends 100 bytes of the data packet 1 and the first 50 bytes of the data packet 2 to the second MAC entity 1032 .
  • the last 50 bytes of the data packet 2 wait for a next available sending occasion.
  • the second MAC entity 1032 receives the data packets of 150 bytes, starts the HARQ process, and sends the data packets to the fourth MAC entity 2032 in the receiving node R.
  • the second RLC entity 201 restores the data packets, a case in which a data packet is lost may occur. For example, only the data packets 2 and 3 of the original data packets 1 , 2 , and 3 are restored, that is, the data packet 1 is lost.
  • the second RLC entity 201 triggers the ARQ retransmission by sending a status report 500 to the first RLC entity 101 , so as to instruct the first RLC entity 101 to resent the data packet 1 .
  • the ARQ retransmission may be triggered inside the transmitting node.
  • the MAC layer in the transmitting node notifies the RLC layer of the transmitting node that the data packet 1 is not successfully sent.
  • the data packets do not arrive in sequence. Therefore, whether packet loss exists may be determined only after the RLC layer obtains all data packets. For the situation in FIG. 1 , even if the first 50 bytes of the data packet 2 already arrive at the RLC entity of the receiving node, whether the data packet 2 is lost still cannot be determined. Whether the data packet 2 is lost can be determined only after the last 50 bytes of the data packet 2 are correctly received. As a result, a longer time needs to be set for the timer in the ARQ retransmission, so as to wait for all data that should be received. Therefore, compared with a retransmission response of the HARQ process, the RLC entity includes more data transmission processes and a longer waiting time.
  • the second RLC entity 201 can know that the data packets 1 and 2 are both already lost only by waiting for a longer time and after receiving the data packet 3 , and then the retransmission process is triggered. If more packets are continuously lost, a waiting time is longer.
  • the transmitting node requests the receiving node to perform determining, and the ARQ retransmission may be triggered. For example, after the data packets 1 , 2 , and 3 are sent, the receiving node finds that the data packet 3 is lost, and then triggers the retransmission. Obviously, such waiting is longer.
  • the following further provides a communications device according to an embodiment.
  • a communications device is provided according to this embodiment, where the communications device may be user equipment, or may be a network device on a network side such as a base station.
  • the communications device may include a sending unit 301 and a processing unit 307 , where the sending unit 301 is configured to transmit a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process.
  • the processing unit 307 is configured to: determine that the unlicensed spectrum resource used by the sending unit is unavailable, determine that an unsuccessfully-sent data packet exists in the HARQ process, and trigger ARQ retransmission for the unsuccessfully-sent data packet.
  • the communications device when an unlicensed spectrum is unavailable, the communications device actively triggers the ARQ retransmission.
  • the communications device does not anymore passively wait for an acknowledgement message or a status report sent by the receiving node.
  • the communications device changes from passive to active, thereby avoiding a waiting time before the receiving node sends the acknowledgement message, and the communications device does not need to trigger the ARQ retransmission of an RLC layer by using the HARQ process of a MAC layer of the communications device either.
  • the communications device directly selects an available spectrum resource at the beginning of resource scheduling to perform transmission, thereby shortening a waiting time.
  • the processing unit 307 may further determine that the unsuccessfully-sent data packet includes RLC data of an AM mode or includes important data.
  • the sending unit 301 transmits a first data packet to the receiving node by using a licensed spectrum resource, where the first data packet includes the important data, where the important data is preset, or is configured and notified to the communications device by a network side device.
  • the important data may include at least one type of the following data: a timing advance command (TAC), a secondary cell activation command (SCell active command), a secondary cell deactivation command (SCell deactive command), a continuous reception (Discontinuous Reception, DRX) MAC vacancy unit, a buffer status report (BSR), a power headroom report (PHR), an RLC status report (RLC status report), a UE contention resolution identity (UE Contention Resolution Identity), or an RRC message (RRC message).
  • TAC timing advance command
  • SCell active command secondary cell activation command
  • SCell deactivation command SCell deactive command
  • a continuous reception Discontinuous Reception, DRX
  • BSR buffer status report
  • PHR power headroom report
  • RLC status report RLC status report
  • UE Contention Resolution Identity UE Contention Resolution Identity
  • the processing unit 307 may include a determining unit 3071 and a control unit 3075 .
  • the determining unit 3071 is configured to: determine the unlicensed spectrum resource used by the sending unit is unavailable, and determine that the unsuccessfully-sent data packet exists in the HARQ process.
  • the control unit 3075 is configured to: after the determining unit determines that the unlicensed spectrum resource is unavailable and the unsuccessfully-sent data packet exists, trigger the ARQ retransmission for the unsuccessfully-sent data packet.
  • the determining unit 3071 is further configured to determine that the unsuccessfully-sent data packet includes the RLC data of the AM mode or includes the important data.
  • the control unit 3075 is configured to: after the determining unit determines that the unlicensed spectrum resource is unavailable and the unsuccessfully-sent data packet exists, and determines that the unsuccessfully-sent data packet includes the RLC data of the AM mode or includes the important data, trigger the ARQ retransmission for the unsuccessfully-sent data packet.
  • a beneficial effect of determining a type of data in the data packet and determining, according to the type of the data, to trigger the ARQ retransmission is that when the important data is detected, the actively-triggered ARQ transmission process strengthens a timely response to the important data, thereby further enhancing timeliness and stability of data transmission.
  • the control unit 3075 is further configured to generate the BSR; or is further configured to: after it is determined that a timer related to the BSR triggered to be generated is running, set the timer to be timed out.
  • the control unit 3075 when the communications device is user equipment UE, the control unit 3075 is further configured to: after the determining unit 3071 determines that the unsuccessfully-sent data packet includes the BSR, generate a BSR; or is further configured to: after the determining unit 3071 determines that the unsuccessfully-sent data packet includes the BSR, and determines that a timer related to the BSR triggered to be generated is running, set the timer to be timed out.
  • the control unit 3075 when the communications device is user equipment UE, the control unit 3075 is further configured to: after the determining unit 3071 determines that the unsuccessfully-sent data packet includes the PHR, generate a PHR; or the control unit 3075 is further configured to: after the determining unit 3071 determines that a timer related to the PHR triggered to be generated is running, set the timer to stop.
  • the communications device may further include: a first MAC layer execution unit 500 , configured to execute the HARQ process by using the unlicensed spectrum resource; an RLC layer execution unit 505 , configured to execute RLC retransmission.
  • the device may also include a second MAC layer execution unit 507 , configured to execute the HARQ process by using an available spectrum resource.
  • the processing unit 307 being configured to trigger the ARQ retransmission for the unsuccessfully-sent data packet includes: instructing the first MAC layer execution unit 500 to send, to the RLC layer execution unit, a first message used to trigger the RLC layer to execute the ARQ retransmission, where the first message includes first information, the first information is used to identify the first data packet, and the first data packet is the data packet that is unsuccessfully sent by the first MAC layer execution unit 500 by using the unlicensed spectrum resource.
  • the RLC layer execution unit 505 retransmits the first data packet according to the first information included in the first message.
  • the second MAC layer execution unit 507 acquires the first data packet from the RLC layer execution unit, and sends the first data packet to the receiving node by using the sending unit 301 .
  • the determining, by the processing unit 307 , that the unlicensed spectrum resource is unavailable may include any one of the following: detecting, by the processing unit 307 , that the unlicensed spectrum resource is occupied by another device, and determining that the unlicensed spectrum resource is unavailable; detecting, by the processing unit 307 , that an available time of the unlicensed spectrum resource is timed out, and determining that the unlicensed spectrum resource is unavailable; or receiving, by the processing unit 307 , a message sent by a network node and indicating that the unlicensed spectrum resource is unavailable, and determining, according to the message, that the unlicensed spectrum resource is unavailable.
  • the sending unit 301 sends the important data only in a licensed spectrum.
  • a data processing method includes transmitting, by a communications device, a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process.
  • the method also includes determining, by the communications device, that the unlicensed spectrum resource is unavailable and an unsuccessfully-sent data packet exists in the HARQ process.
  • the method also includes triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet.
  • a data packet may be divided into important data and ordinary data according to importance of data.
  • the important data is preset. For example, it is stipulated that some data is the important data in a preset protocol.
  • the important data may be configured and notified to the communications device by a network side device.
  • a base station device stipulates that some data is the important data, and notifies user equipment UE.
  • the important data includes but is not limited to control signaling of RRC, RLC, and MAC layers, which is exemplified as follows: a timing advance command (TAC), a secondary cell activation command (SCell active command), a secondary cell deactivation command (SCell deactive command), a continuous reception (Discontinuous Reception, DRX) MAC vacancy unit, a buffer status report (BSR), a power headroom report (PHR), an RLC status report (RLC status report), a UE contention resolution identity, or an RRC message.
  • TAC timing advance command
  • SCell active command secondary cell activation command
  • SCell deactivation command SCell deactive command
  • DRX continuous reception
  • BSR buffer status report
  • PHR power headroom report
  • RLC status report RLC status report
  • UE contention resolution identity a UE contention resolution identity
  • the triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet includes: sending, by a MAC layer that uses the unlicensed spectrum resource in the communications device, to an RLC layer in the communications device, a first message used to trigger the RLC layer to execute the ARQ retransmission, where the first message includes first information, the first information is used to identify the first data packet, and the first data packet is the data packet that is unsuccessfully sent by the MAC layer by using the unlicensed spectrum resource; retransmitting, by the RLC layer, the first data packet according to the first information included in the first message; and acquiring, by a MAC layer that uses an available spectrum resource in the communications device, the first data packet from the RLC layer, and sending the first data packet to a peer device.
  • a manner of the determining, by the communications device, that the unlicensed spectrum resource is unavailable may include any one of the following: detecting, by the communications device, that the unlicensed spectrum resource is occupied by another device, and determining that the unlicensed spectrum resource is unavailable, for example, the communications device finds that another interference source already exists in a corresponding frequency band; or when determining, by detection, that an RSSI signal strength of the unlicensed spectrum resource exceeds a preset threshold, the communications device determines that the unlicensed spectrum resource is unavailable; detecting, by the communications device, that an available time of the unlicensed spectrum resource is timed out, and determining that the unlicensed spectrum resource is unavailable; or receiving, by the communications device, a message sent by a network node and indicating that the unlicensed spectrum resource is unavailable, and determining, according to the message, that the unlicensed spectrum resource is unavailable, for example, when receiving a request to send (RTS) or a clear to send (CTS), determining that the unlicensed spectrum resource
  • a transmitting node that is, the foregoing communications device, actively triggers the ARQ retransmission.
  • the transmitting node does not anymore passively wait for an acknowledgement message or a status report sent by the receiving node.
  • the transmitting node changes from passive to active, thereby avoiding a waiting time before the receiving node sends the acknowledgement message, and the transmitting node does not need to trigger the ARQ retransmission of an RLC layer by using the HARQ process of a MAC layer of the transmitting node either.
  • the transmitting node directly selects an available spectrum resource at the beginning of resource scheduling to perform transmission, thereby shortening a waiting time.
  • a transmitting node For an AM mode of data sending modes of an RLC layer, a transmitting node performs transmission after a necessary control protocol overhead is added to high-layer data, and ensures to transfer the high-layer data to a communication peer.
  • the AM mode is a standard mode for packet data transmission, for example, email downloading.
  • this embodiment strengthens protection on important data. A part, which is the same as that of Embodiment 2, of this embodiment is not described again.
  • the method before the triggering, by the communications device, ARQ retransmission for the unsuccessfully-sent data packet, the method further includes: determining that the to-be-sent data packet includes the RLC data of the AM mode or includes the important data.
  • a beneficial effect is that when the important data is detected, the actively-triggered ARQ transmission process strengthens a timely response to the important data, thereby further enhancing timeliness and stability of data transmission.
  • a communications device in this embodiment may be user equipment (UE).
  • UE user equipment
  • a buffer status report (BSR) and a power headroom report (PHR).
  • BSR is a status report used by the user equipment to report a data situation in a buffer of the current UE to a base station (Evolved NodeB, eNB), and the eNB schedules the UE according to the BSR.
  • the PHR is used to provide, to the serving eNB, information about a difference between a maximum transmit power of the UE and an estimated value of a transmit power of a current uplink shared channel (UL-SCH).
  • the BSR when a generated BSR is ready to be sent by a protocol data unit (PDU) forming the MAC layer, the BSR is cancelled. Therefore, if an HARQ process of the MAC PDU including the BSR does not succeed eventually, the BSR cannot be retransmitted either. Based on a same reason, there is also a situation in which the PHR cannot be retransmitted again. Obviously, a higher failure probability of the HARQ process indicates a higher probability that the BSR and the PHR are lost. Such signaling loss causes a system to be unstable.
  • PDU protocol data unit
  • This solution is basically the same as that in Embodiment 2.
  • a main difference is: after the communications device determines that an unlicensed spectrum resource is unavailable, this solution further includes: generating the BSR, and if it is determined that an unsuccessfully-sent data packet includes the BSR, generating the BSR again.
  • a manner for generating the BSR includes but is not limited to the following manners: triggering by a clock, triggering by a specific channel buffer status, or triggering by filling.
  • the timer related to the BSR includes but is not limited to a retransmission BSR timer (retxBSR-Timer), and a periodic BSR timer (periodicBSR-Timer).
  • a condition for triggering the BSR may be that the foregoing timer is timed out. Therefore, a condition for triggering the BSR may be created by setting the foregoing timer to be timed out.
  • a data buffer situation of the UE may be reported to the base station in time, so that the base station performs resource scheduling in time, thereby shortening a data sending delay.
  • this solution further includes: generating the PHR; or further includes: after it is determined that a timer related to the PHR is running, setting the timer to stop.
  • a process of triggering the PHR may be generating the PHR at an RRC layer.
  • the timer related to the PHR includes but is not limited to a periodic PHR timer (periodicPHR-Timer). The PHR is triggered to be regenerated by stopping the periodicPHR-Timer.
  • the condition for triggering the PHR may be the foregoing two forms. Therefore, by means of the foregoing process, a case in which PHR data cannot be retransmitted because the PHR data is cancelled after the PHR data is sent by a MAC PDU can be effectively avoided, thereby reducing a probability of PHR loss and improving stability of a system.
  • a condition may be created, by using the foregoing setting for the timer, for triggering the PHR, thereby further ensuring timeliness and effectiveness of data transmission.
  • a communications device transmits a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process.
  • the communications device determines that the unlicensed spectrum resource is unavailable and an unsuccessfully-sent data packet exists in the HARQ process.
  • the unsuccessfully-sent data packet is moved from an HARQ buffer of the unlicensed spectrum resource to a vacant HARQ buffer of a licensed spectrum resource.
  • the communications device may include a sending unit, a processing unit, and an HARQ buffer, where the HARQ buffer is configured to buffer a to-be-sent data packet, and the HARQ buffer includes an HARQ buffer of the unlicensed spectrum resource and an HARQ buffer of a licensed spectrum resource; the sending unit is configured to transmit a data packet to a receiving node by using an unlicensed spectrum resource and by using an HARQ process; and the processing unit is configured to: determine that the unlicensed spectrum resource is unavailable and an unsuccessfully-sent data packet exists in the HARQ process, and move the unsuccessfully-sent data packet from the HARQ buffer of the unlicensed spectrum resource to a vacant HARQ buffer of the licensed spectrum resource.
  • the unsuccessfully-sent data packet is stored in a first buffer in a first MAC layer execution unit.
  • the so-called movement refers to copying data over without performing processing on the data. If data is stored in an original buffer, the data in the original buffer is deleted.
  • the sending unit sends the unsuccessfully-sent data packet obtained after the movement to the receiving node by using the HARQ process.
  • the MAC layer sends data by using an HARQ entity in the MAC layer.
  • the HARQ entity totally has eight processes, and each process corresponds to one HARQ buffer.
  • a vacant buffer is searched for in the HARQ buffer of a MAC entity corresponding to a selected spectrum resource.
  • a search process may be a process that cycles until the vacant buffer is found. It should be noted that moving the data to the HARQ buffer of the licensed spectrum does not affect work of an RLC layer.
  • the RLC layer maintains a normal data transmission process of the RLC layer.
  • an unsuccessfully-sent data packet is moved from an HARQ buffer of an unlicensed spectrum resource to a vacant HARQ buffer of a licensed spectrum resource.
  • Data in the buffer does not need to be processed, thereby reducing a repetitive and unnecessary processing process, so that low-layer data does not need to experience a high-layer processing process again, thereby further shortening a waiting time and enhancing timeliness of data transmission.
  • Timely transmission of data may prevent a possible data interrupt situation from occurring, thereby enhancing effectiveness of data transmission.
  • a difference between this embodiment and Embodiment 2 is that important data is not sent on an unlicensed spectrum resource, but sent only on a licensed spectrum resource.
  • a data packet may be divided into important data and ordinary data according to importance of data.
  • the important data is preset. For example, it is stipulated that some data is the important data in a preset protocol.
  • the important data may be configured and notified to the communications device by a network side device.
  • a base station device stipulates that some data is the important data, and notifies user equipment UE.
  • the important data includes but is not limited to control signaling of RRC, RLC, and MAC layers, which is exemplified as follows: a timing advance command (TAC), a secondary cell activation command (SCell active command), a secondary cell deactivation command (SCell deactive command), a continuous reception (Discontinuous Reception, DRX) MAC vacancy unit, a buffer status report (BSR), a power headroom report (PHR), an RLC status report (RLC status report), a UE contention resolution identity, or an RRC message.
  • TAC timing advance command
  • SCell active command secondary cell activation command
  • SCell deactivation command SCell deactive command
  • DRX continuous reception
  • BSR buffer status report
  • PHR power headroom report
  • RLC status report RLC status report
  • UE contention resolution identity a UE contention resolution identity
  • the important data is sent only on a licensed spectrum resource, so as to completely avoid a problem of instability of the unlicensed spectrum resource, thereby ensuring timeliness and stability of data transmission.
  • the following further provides a communications system according to an embodiment.
  • the communications system includes a base station and user equipment. It can be understood that the communications device in any one of the foregoing embodiments may be used as the base station. Similarly, the communications device in any one of the foregoing embodiments may be used as the user equipment. As long as at least one of the base station or the user equipment uses the method, it should fall within the scope of the present invention.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the described apparatus embodiment is merely exemplary.
  • the unit division is merely logical function division and may be other division in actual implementation.
  • a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces.
  • the indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.
  • the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. A part or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • functional units in the embodiments may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.
  • the integrated unit may be implemented in a form of hardware, or may be implemented in a form of combining a software functional unit and hardware.
  • the integrated unit When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium.
  • the software product is stored in a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or a part of the steps of the methods described in the embodiments of the present invention.
  • the foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc.

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US20160337870A1 (en) 2016-11-17
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WO2015113259A1 (zh) 2015-08-06
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